sickels



lifting rod.

in each figure.

nnnnnnrck" E. sicKnLs, or Nnw vonk, N. Y.

curorr.

Specification of Letters Patent No. 8,760, dated February 24, 1852.

To all whom 'it may concern: j

Be it known that I, FREDERICK E. SICKELS, of the city, county, and State of New York, have invented a new and Improved `Mode of Tripping Cut-Gif Valves; and I do hereby declare that the following is a full and exact description thereof, reference` being had to the accompanying drawings and to letters of reference marked thereon.

In cut-offs as heretofore constructed, in operating the catch `by the closing movement alone, the valve `.could not be tripped until suHicient motion had taken place to operate the whole'extent of the catch, thus `occasioning an unavoidable delayin tripping the valve. j l

The nature of my invention therefore consists, in operating the catch or hold, and liberating the valves of trip cut-offs, on the movement to close, or return of the valve mo- `tion by means of an adjustable cam or lever, after -it has been partially operated upon, on

the opening movement of the valve motion, so as to leave as little movement of the catch to effect the liberation of the` valve as may be desired to be accomplished by the return movement; thereby being enabled to liberate the valve, and cut off the steam, as

`near the iirst of the return movement as may be desired. j

`Figure l, side view. Fig. 2, frontview.

A, toe on the rock shaft. B, foot on the C, lifter. D, valve stem. E, catch piece on lifter, having a projection catching under the socket F, at Gr, H.

J and K are two arms, having wedges or inclined planes L, M, upon them as shown in Figs. 3 and 4; they being edge viewsand the same letter referring to the same parts N, lever upon which the arms J and K, connect with joints at O, and P-the lever itself vibrating upon a pin at Q, and being connected with an adjusting rod S, by a joint and pin at R. U an adjusting screw socket working on the adjusting rod S. E, Fig. 5, top view of catch piece or lever having a projection catching under the socket F, at G, H. V wedge piece on K, having its inclined plane or wedge surface running in the direction from l to 2. The

j other wedge pieces on the `arms J and K larger partdownward as shown in Fig. 4, and the other, the largerl part upward as shown in Fig. 8. lV, Figs. 3 and 4 section of lifter holding the lower end of the arms J and K, from being moved out of their proper position when the wedges L and M act upon the catch piece. Figs. 3 and 4 section of catch piece `at the part where it is acted upon by the wedges L and M, its eXtreme end at that part being beveled in the direction from 8 to 9 Fig. 1.

The operationis as follows: The wedges or inclined planes L, M, V, being in the position shown in the drawings (Figs. l and 2), and the catch piece E, moving upward,

in the openingV movement from the dotted line Y to the dotted line Z, as represented in the drawing in Figs. 1, 2, 3, and 4. Then as the catch piece moves upward, its inclined endat 8, 9, strikes the face of the wedge or inclined plane V, at l, 2, and moves it in the'direction of from 10,'to 1l, the arm K, turning on a joint at P; the wedge L, moving out the catch piece, until it has reached the extent of its upward movement, `and is about to return, the projection on the catch piece being then under the socket, as shown in Fig. 5, and the end of the catch piece being in the position shown by red lines l2, 13, Figs. 3 and 4. The wedge M, now moves back under the end of the catch piece, the arm K, turning on the pin at P, and being actuated by a ball or weight &, on a hori- Zontal extension of the'arm K. Now by the `first of return movement, the catch piece passes over the larger part of the wedge M, and is thereby entirely moved out from under the socket, and the valve attached"tp the valve stem is permitted to close.

By turning the adjusting screw socket U, so as to lower the wedge L, and raise the wedge M, the catch piece would be farther moved out from under the socket by the opening motion, and leave less to be accomplished bythe return motion, thereby cutting oft' the steam nearer the iirst of the return movement, and by turning the'adjusta Vble socket, so `as to raise the wedge L, and

lower the wedge M, the upper movement would operate the catch piece less, and the downward movement more, thereby cutting the steam off` farther from the first of the return movement.

Fig. 6, represents in perspective, a portion of the two arms J, K, with their wedges ,or inclined planes L, M, V, and the catch piece E, detached from the other parts of the apparatus.

Having thus fully described my invention What I claim therein as new and desire to secure by Letters Patent, isp Operating the catch or hold, and liberating the valves of out-oils, on the movement to close, or return motion of the valve after it has been partially operated upon in opening, substantially in the manner as herein 

